MOCKTEST/CHAPTER : HEAT TREATMENT
Technical study zone online Coaching (Instructor : Sushovan Das)
CHAPTER : HEAT TREATMENT
1. 1.What is the heating temperatuet range for
hypoeutectoid steels above the upper critical
temperature while annealing?
|
A.
30-80 °C |
B.
30-70 °C |
C.
30-60 °C |
D.
30-50 °C |
2. 2. What is the cooling rate for carbon steel
while annealing?
|
A.
100-200 °C /hr |
B.
100-110 °C /hr |
C.
100-150 °C /hr |
D.
100-130 °C /hr |
3. 3.What is the upper critical temperature of
carbon content in steel,if carbon content up to 1.15% in steel ?
|
A.
600 °C |
B.
700 °C |
C.
800 °C |
D.
850 °C |
4. 4.Which percentage of arbon content steel is not
respond to direct hardening process?
|
A.
0.7 % |
B.
0.15 % |
C.
0.8 % |
D.
0.9 %
|
5.
What temperature the carbonaceous gases
penetrate into the surface of the work piece while carburising ?
|
A.
880-1150 °C |
B.
880-1050 °C |
C.
880-930 °C |
D.
880-900°C |
6.
Which surface hardening process suitable for
thin cases about 0.25 mm?
|
A.Case
hardening |
B. Gas
carburising |
C.Pack carburising |
D.Liquid
Carburing |
7.
Which percentage of carbon content in steel is
used for flame hardening ?
|
A.
0.35%-0.95% |
B.
0.35%-0.9% |
C.
0.35%-0.8% |
D.
0.35-0.7% |
8.
Which surface hardening process is used in
production method?
|
A.Nitriding |
B.Pack
Carburising |
C.Induction
Hardening |
D.Flame
Hardening |
9.
What is the name of energiser that added to
speed up the carburising process in pack carburising ?
|
A.
Wood |
B.Barium
Carbonate |
C. Bone |
D.Leather
|
10.
Which surface hardening process is suitable
for alloyed and un alloyed types of steels?
|
A.Pack
carburising |
B.Liquid
carburising |
C.Salt-bath
nitriding |
D.Gas
nitriding |
11.
High strength nut and bolt make to ….
|
A.
Hard |
B.
Case Hard |
C.
Temper |
D.
Nitride |
12.
The jobs are placed in the ash or __________
for annealing .
|
A.
Lime Stone |
B.
Iron |
C.
Hemetite |
D.
Oxide |
13.
It is a chemical combination of iron and
carbon
|
A.
Ferrite |
B.
Cementite |
C.
Austenite |
D.
Pearlite |
14.
In liquid carburizing , which one of the
following salt is not used
|
A.Sodium
carbonate |
B.Sodium
cyanide |
C.Barium
chloride |
D.Sodium
sulphate |
15.
Great
depth of surface hardening is
|
A.
Tempering |
B.Flame
Hardening |
C.Induction
Hardening |
D.Carburising |
16.
Tempering Temperature of Twist drill is
|
A.
230 °C |
B.
250 °C |
C.
270 °C |
D.
260 °C |
17.
For steel , Which one of the following
properties can be enhanced upon annealing?
|
A.Hardness |
B.Toughness. |
C.Ductility |
D.Resilience
|
18.
Upon annealing , Eutectoid steel converts to
which of the following?
|
A.Pearlite |
B.Cementite |
C.Austenite |
D.Martensite
|
19.
For Normalising , the steel is heated ________
its upper Critical temperature
|
A.30-40
above |
B.30-40
below |
C. 50-60
above |
D. 50-60
below |
20.
Internal stresses in martensite steel are
relieved by heating at ____________
|
A.
200 °C |
B.
500 °C |
C.
800 °C |
D.
1000 °C |
21.
Annealing is done
|
A.To
harden the surface |
B.For
Surface smoothness |
C.For
relieving stresses |
D.to
improve microstructure for good surface finish |
22.
Carbon percentage in steel for carburising is
usually
|
A.
0.1-0.2% |
B.
0.2-0.35% |
C.
0.4-0.6% |
D.
0.7-0.9% |
23.
Which of the following hardening process is
generally used for non ferrous materials?
|
A.
Cyaniding |
B. Flame
Hardening |
C. Pack
carburising |
D. Age
hardening |
24.
Austempering is the heat treatment process
used to obtain greater?
|
A.
Hardness |
B.
Toughness |
C.
Brittleness |
D.
Ductility |
25.
In stress relief annealing , steel is heated
to a temperature between
|
A.200-250
°C |
B.300-325
°C |
C.385-440
°C |
D.500-550
°C |
26.
Hardness and tensile strength in austenite
stainless steel can be increased by
|
A.Hardening
and Cold working |
B.Normalizaing |
C.Martempering |
D. Full
Annealing |
27.
When a steel containing more than 0.8% carbon
is cooled slowly below the lowercritical point , it consist of
|
A.mainly pearlite |
B.
mainly ferrite |
C.
ferrite and pearlite |
D.
pearlite and cementite |
28.
The machine tool guide ways are usually hardened by
|
A.vacuum
hardening |
B.
martempering |
C.
induction hardening |
D. flame
hardening |
29.
In the austempering process of heat treatment
, austenite changes into
|
A.matensite |
B.
toorsite |
C.
sorbite |
D.
bainite |
30.
The temperature point at which the change ends
on heating the steel is called?
|
A.Lower
critical point |
B. upper
critical point |
C. point
of recalescence |
D. point of derecalescence |
31.
The essential constituent of a hardened steel
is
|
A.
pearlite |
B.
austenite |
C.
martensite |
D.
toorsite |
32.
The process which improves the machinability
of steels , but lowers the hardness and tensile strength is
|
A. normalising |
B. full annealing |
C. process annealing |
D. spheroidising |
33.
The process used
for relieving the internal stresses previously set up in the Metal and for
increasing the machinability of steel, is
|
A. normalising |
B. full annealing |
C. process annealing |
D. spheroidising |
34.
Which of the
following is the hardest constituent of steel?
|
A. Ledeburite |
B. Austenite |
C. Austenite |
D. Martensite |
35.
Mild steel can
be converted into high carbons steel by which of the following heat treatment
process?
|
A. Annealing |
B. Normalizing |
C. Case hardening |
D. Nitriding |
36.
Which treatment method is also called as
‘’Drawing’’?
|
A.Tempering |
B.case hardening |
C. Annealing |
D. Normalising |
37.
Match the following ( 1X6 = 6)
38.
Match the following ( 1X10 = 10 )
39.
Match the following ( 1X6 = 6)
40.
The purpose of normalising is to
|
A.Soften the metal |
B. increase the toughness |
C. refine the structure |
D. harden the surface |
41.
Which one of the following processes is
adopted to improve the internal structure of steel , which has been subjected
severe hammering ?
|
A. Hardening |
B. Annealing |
C. Normalising |
D. Tempering |
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